Bài 1:
\(n_{N_2}=\dfrac{2,8}{28}=0,1\left(mol\right)\)
\(n_{O_2}=\dfrac{6,4}{32}=0,2\left(mol\right)\)
PT: \(2N_2+5O_2\underrightarrow{t^o}2N_2O_5\)
Xét tỉ lệ: \(\dfrac{0,1}{2}>\dfrac{0,2}{5}\), ta được N2 dư.
Theo PT: \(n_{N_2O_5}=\dfrac{2}{5}n_{O_2}=0,08\left(mol\right)\)
\(\Rightarrow V_{N_2O_5}=0,08.24,79=1,9832\left(l\right)\)
Bài 2:
\(n_{Cu}=\dfrac{3,2}{64}=0,05\left(mol\right)\)
\(n_{Cl_2}=\dfrac{12,395}{24,79}=0,5\left(mol\right)\)
PT: \(Cu+Cl_2\underrightarrow{t^o}CuCl_2\)
Xét tỉ lệ: \(\dfrac{0,05}{1}< \dfrac{0,5}{1}\) ta được Cl2 dư.
Theo PT: \(n_{CuCl_2}=n_{Cu}=0,05\left(mol\right)\Rightarrow m_{CuCl_2}=0,05.135=6,75\left(g\right)\)
Bài 3:
\(n_{Ag}=\dfrac{10,8}{108}=0,1\left(mol\right)\)
\(n_{H_2S}=\dfrac{17}{34}=0,5\left(mol\right)\)
PT: \(Ag+H_2S\rightarrow Ag_2S+H_2\)
Xét tỉ lệ: \(\dfrac{0,1}{1}< \dfrac{0,5}{1}\), ta được H2S dư.
Theo PT: \(n_{Ag_2S}=n_{H_2}=n_{Ag}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Ag_2S}=0,1.248=24,8\left(g\right)\\V_{H_2}=0,1.24,79=2,479\left(l\right)\end{matrix}\right.\)